CP
Clarence Peterson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Clarence Peterson across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents Otto & Walter — first a son (b.~1915), then head of a 5-person household.
Age 25
b. ~1915
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Peterson |
| Given Name | Clarence W. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | salesman |
| Industry | wholesale plumbing supply |
| Class of Worker | PW |
| Hours Worked | 52 |
| Income (1939) | 1500 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Salesman |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1915 |
Household Members
Census records only state relationship to the household head.
Pairwise kinship is derived (~90–95% accurate), not recorded.
Step/blended families and boarders can break it.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Clarence | Age | Birth yr |
|---|---|---|---|---|
| Otto Peterson | Son | — | 25 | ~1915 |
| Clarence Peterson | Son | — | 25 | ~1915 |
| Otto Peterson | Head | — | 60 | ~1880 |
| Katherine Peterson | Other | — | 27 | ~1913 |
| Gordon Peterson | Son | — | 26 | ~1914 |
Census Appearances
1920
Cook, Illinois
Son, age 4
Cook, Illinois · implied b. ~1916 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Peterson |
| Given Name | Clarence |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Son, age 14
Cook, Illinois · implied b. ~1916 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Peterson |
| Given Name | Clarence |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 25
Cook-County, Illinois · implied b. ~1915 — 5 household members
| Surname | Peterson |
| Given Name | Clarence W. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Occupation | salesman |
| Industry | wholesale plumbing supply |
| Class of Worker | PW |
| Hours Worked | 52 |
| Income (1939) | 1500 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
Model Tree
An inferred pedigree reconstructed from census links — up to 4 generations within the 1900–1950 window. Closer generations are built from household co-residence; deeper ones are bridged by following a relative to their own childhood census. Confidence compounds and weakens with each generation.
Our Model Tree links Clarence Peterson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Otto Peterson (~0.92 confidence) and father Walter Peterson (~0.92 confidence) and father Walter Peterson (~0.92 confidence) and mother Minnie Peterson (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Otto Peterson
b. ~1880
Source father
● Household
· direct · ~0.92
Father
Walter Peterson
b. ~1893
Source father
● Household
· direct · ~0.92
Father
Walter Peterson
b. ~1893
Source father
● Household
· direct · ~0.92
Mother
Minnie Peterson
b. ~1894
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Clarence Peterson
Son · 1940 · age 25 · b. ~1915 · Illinois
★ You are viewing this record
Sibling
Gordon Peterson
Sibling · 1940 · age 26
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Otto Peterson
Sibling · 1940 · age 25
Source co-child of head (derived)
● Co-child · derived · ~0.88
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Cook-County, Illinois
Open full size
1940 US Federal Census — Cook-County, Illinois
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-00990-00475)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Anna Peterson | 20 | Daughter | Seamstress | Illinois |
| 42 | Otto H. Peterson | 60 | Head | Clerk | Illinois |
| 43 | Gordon Peterson | 26 | Son | Shipping Clerk | Illinois |
| 44 | Otto B. Peterson | 25 | Son | — | Illinois |
| 45 | Clarence W. Peterson THIS PERSON | 25 | Son | Salesman | Illinois |
| 46 | Katherine Peterson | 27 | Daughter-in-law | — | Tennessee |
| 48 | Helen Unferling | 74 | Head | — | Germany |
| 49 | Lilly Unferling | 54 | Daughter | Cord Repairer | Illinois |
| 50 | Mike Grohanka | 63 | Head | Hat Cleaner | Austria |
| 51 | Rosa Grohanka | 61 | Wife | — | Hungary |
| 52 | Ernest Grohanka | 20 | Grandchild | House Cleaning | Illinois |
| 53 | Caroline Apeck | 82 | Mother-in-law | — | Austria |
| 54 | Otto Deppe | 45 | Head | Salesman | Germany |
| 55 | Francesca Deppe | 50 | Wife | — | Germany |
| 56 | Marie Plumaljanger | 51 | Head | — | Germany |
| 57 | Frank Plumaljanger | 26 | Son | Machinist | Illinois |
| 58 | Dorothy Plumaljanger | 20 | Daughter | Bookkeeper | Illinois |
| 59 | Iver Freeland | 69 | Head | — | Norway |
| 60 | Anna Freeland | 64 | Wife | — | Illinois |
| 61 | Milnor Freeland | 39 | Son | Doctor | Illinois |
| 62 | Stanley Eget | 45 | Head | Truck Driver | Illinois |
| 63 | Nellie Eget | 69 | Mother | — | Poland |
| 64 | Robert Baer | 43 | Head | Chief Inspector | Illinois |
| 65 | Edna Baer | 42 | Wife | — | Illinois |
| 66 | Alice Baer | 15 | Daughter | — | Illinois |
| 67 | Dennis Riordan | 66 | Head | Plumber | Illinois |
| 68 | Mary Riordan | 64 | Wife | — | Illinois |
| 69 | Agnes Riordan | 40 | Daughter | Assembler | Illinois |
| 70 | Mary Riordan | 30 | Daughter | — | Illinois |
| 71 | Fred Brunk | 68 | Head | Piano Mover | Illinois |
| 72 | Louise Brunk | 64 | Wife | — | Missouri |
| 73 | Katherine Brunk | 19 | Daughter | Egg Grader | Illinois |
| 74 | Louis Mathis | 31 | Roomer | Sprayer | Illinois |
| 75 | Anna Mathis | 29 | Roomer | Machine Operator | Arkansas |
| 76 | Ronald Mathis | 2 | Roomer | — | Illinois |
| 77 | Madeline Loftus | 35 | Roomer | — | Illinois |
| 78 | Edward Loftus | 33 | Roomer | Truck Driver | Illinois |
| 79 | William Maiers | 60 | Roomer | Salesman | Illinois |
| 80 | Olivia Petersen | 60 | Head | — | Denmark |
Pedigree Summary
Clarence + 2 siblings
Gen 1 · 4 parents
~0.92
Max depth 4 (1900–1950 window)
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1940 United States Federal Census (NARA). Our Model Tree links this person across census decades using XGBoost-based record linkage, with per-link confidence scores. Household corroboration strengthens the signal when co-residents appear on the same census pages in multiple years.
Source: National Archives and Records Administration (NARA)